The atlas uses a unique cam wheel that to the best of my knowledge is only supported by megasquirt 3 or pro.

The 4&5 cyl have a common cam wheel, the 4200 has is own and is different from the 4&5.

So unless the Link Ecu has the cam wheel decoder programmed in a harness for it does not gain much.

Make a standalone harness for MS.


51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them